22年生云南松优良家系子代遗传变异分析  

Analysis of Genetic Variation in 22-year-old Pinus yunnanensis Progenies from Superior Families

作　　者：常恩福[1,2] 孟广涛 肖桂英[3] 郑畹 李思广[1] 李娅[1] 李品荣[1,2] 丁玉雄[3] CHANG Enfu;MENG Guangtao;XIAO Guiying;ZHENG Wan;LI Siguang;LI Ya;LI Pinrong;DING Yuxiong(Yunnan Academy of Forestry,Kunming 650201,China;Jianshui Station for Desert Ecological System Observation and Research,Jianshui Yunnan 654399,China;Forestry Technology Extension Station of Jianshui County,Jianshui Yunnan 654300,China)

机构地区：[1]云南省林业科学院,昆明650201 [2]云南建水荒漠生态系统国家定位观测研究站,云南建水654399 [3]建水县林业技术推广所,云南建水654300

出　　处：《种子》2020年第11期5-10,共6页Seed

基　　金：云南省重点研发计划项目(2019 BC 0001-03)。

摘　　要：以8个种源27个云南松优良家系22年生的子测林为研究对象,通过对树高、胸径、材积、冠幅、直干率及木纹理扭转度等6个表型性状的测定及其遗传参数估算,研究其子代的遗传变异并进行良种筛选。结果表明,在其子测林的6个性状中,除冠幅外,其余性状在种源间、家系间均存在显著或极显著差异;各性状遗传力虽大小不一,但均受较强的遗传控制;遗传增益较为有限或不明显,说明云南松仅依据其表型性状进行优树选择和造林,并不能保证子代林可获得较高的遗传增益。采用材积、直干率和直纹率3个性状对27个优良家系再进行综合选择,筛选出2个良种,即27号和10号家系,其树高和胸径长量分别较对照提高了10.54%~28.37%和26.49%~28.92%,材积、直干率和直纹率的遗传增益为60.93%~75.54%、6.13%、4.70%~8.05%。云南松就种源而言,以石林最好,双柏次之。In this paper,the genetic variation of the 22-year-old sub-forests of 27 Pinus yunnanensis progenies from superior families of 8 provenances were selected as experimental subjects to determine 6 phenotypic traits including tree height,diameter at breast height(DBH),volume of timber,crown width,straight stem ratio and wood graintwist degree,and analyzed their genetic parameter estimation.Also,the genetic variation of the progenies were studied and the superior varieties were screened based on results above.The results showed that there were significant(p<0.05)or extremely significant(p<0.01)differences between provenances and families in all the 6 traits except for crown width and the heritability of each trait varied,but they were all under strong genetic control.The genetic gain was limited or not obvious,indicating that good tree selection and afforestation only based on phenotypic traits of Pinus yunnanensis could not guarantee higher genetic gain of its offspring.Three traits including volume of timber,straight stem ratio and wood graintwist degree were used to select 27 excellent families,and two excellent families,namely No.27 and No.10,were screened out.The tree height and DBH both the two families increased by 10.54%-28.37%and 26.49%-28.92%respectively compared with the control.In addition,the genetic gains of volume of timber,straight stem ratio and wood graintwist degree were 60.93%-75.54%,6.13%,4.70%-8.05%.In terms of provenance of Pinus yunnanensis,the Shilin was the best,and followed by Shuangbai.

关 键 词：云南松 优良家系 子测林 遗传参数 良种筛选 再选择 

分 类 号：S791.257[农业科学—林木遗传育种]